FNW 2000B User Manual
Figure 2000B
KNIFE GATE VALVES
STAINLESS STEEL HIGH PERFORMANCE
RESILIENT SEATED KNIFE GATE VALVE
The gure 2000B is an all cast stainless steel body
and yoke with investment cast packing follower.
Reminiscent of high performance buttery valves that
utilize a retaining ring to secure the valve seat, the dual
seat, bidirectional shut-off of the 2000B is a unique
design that performs in many applications not typical of
knife gate valves.
Features:
• Flex Teon Seats for Positive Shut Off at Minimal
Line Pressure
• Bidirectional Shutoff
• Cast Stainless Steel Body, Yoke and Packing Gland
• Thrust Ball Bearing Yoke Bushing (6” & Larger)
• Ductile Iron Handwheel
• Bonnetless, Outside Screw & Yoke
• Rising Stem
• Meets MSS SP-81 Specication for 150 PSI CWP
• Cast Lugs in Yoke for Lockout in Closed Position or
Optional Open Position (Lock Bar is Optional)
• Smooth Flow, Non-clogging Seat Design
• Available in sizes from 2” to 24”
Bidirectional
Resilient Seated
Standards:
• Design: MSS SP-81
• Flange Drilling: ANSI B16.5
• Shell Test: MSS SP-81
• Seat Test: Exceeds MSS SP-81
• Material: ASME B16.34
www.fnw.com
Flex Teon Seats
Seat Ring O-Ring
Retainer Ring
Packing Options
Type
PTFE Impregnated
Fiber (Standard)
Pure TFE 425ºF
TFE Fiber (Ultra) 500ºF
Graphite Filament Yarn 1000ºF
Temperature
Limit
425ºF
Seat Ring
The FNW gure 2000B utilizes a seating design that provides positive
shut-off in both directions, even at low pressure differentials. Similar
to high performance buttery valve designs, the gure 2000B uses
mechanically retained seat rings to hold the seats in place. The RTFE
seats are carried on the retainer rings and are pre-compressed with
o-rings to provide sealing pressure against the knife blade. These o-rings
also act as the seal between the body and seat rings. Seat material
can easily be replaced without disturbing the valve packing. This seat
conguration also improves the longevity of the seat as it is not directly in
the ow path.
Seat Rings
Made of RTFE, the seat rings are secured in place by an integral locator
lip around its circumference, tted into the valve body. Dual rings insure
shut-off in both directions.
Seat Ring O-Ring
Behind each seat ring is a hefty EPDM o-ring. This o-ring not only
provides sealing, but also maintains pressure behind the seat ring,
ensuring a tight shut-off.
Retainer Ring
Holding the seat rings and o-rings in place are the retainer rings. These
heavy stainless steel rings make replacing the seats and o-ring quick and
easy.
Options
FNW Valve Company offers many options
and modications for valves. These include,
but are not limited to:
• Actuation including ratchets, chain wheels,
AWWA nuts, gear-operators, pneumatic &
hydraulic cylinders, and electric actuators
• Packing options for pH and temperature
requirements
• Back seat stops for low ΔP or reverse
operation applications, or to prevent knife
blade deection
• V-ports for reduced plugging in metering
applications
• Stem extensions in carbon and stainless
steel
• Conversion to non-rising stem (NRS)
• Deection cones in Ni-Hard and HDPE for
added seat and gate protection in abrasive
services
• Flush ports to clear suspended matter from
the valve chest or seat pocket area
• Quick opening levers
Figure Number Matrix
FNW 2000BT Size
SIZE CODE
2 = K
2-1/2 = L
3 = M
4 = P
6 = U
8 = X
10 = 10
12 = 12
14 = 14
16 = 16
18 = 18
20 = 20
24 = 24
2 = K
2-1/2 = L
3 = M
4 = P
6 = U
Repair Kits
FNW 2000RKT Size
Flow Coefcients, Port Areas, & Weights
Size Cv Port Area (in²) Wt. (Lbs)
2 195 2.69 17.75
2-1/2 320 3.97 20.25
3 500 5.98 25.5
4 1,100 10.98 34.5
6 3,200 25.59 64
8 5,400 43.92 97
10 7,900 70.1 153
12 10,700 102.38 223
14 13,800 132.67 256
16 17,000 166.64 382
18 20,000 214.75 428
20 24,000 268.67 613
24 31,000 395.29 783
SIZE CODE
8 = X
10 = 10
12 = 12
14 = 14
16 = 16
18 = 18
20 = 20
24 = 24
• Gate scraper
Contact FNW for knife gate valve options.
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